Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Seung Jae Lee is active.

Publication


Featured researches published by Seung Jae Lee.


Ships and Offshore Structures | 2017

Numerical simulation of motion of single and side-by-side vessels in regular waves using OpenFOAM

H.T. Ok; Seung Jae Lee; J.H. Choi

ABSTRACT In the study of the motions of vessels floating side by side, it is necessary to employ accurate methods of analysis other than potential theory to overcome inaccurate solutions due to viscous effects. In this study, computational fluid dynamics (CFD) simulations for the analysis of single- and side-by-side vessels are performed. The CFD codes are formulated for solving the Navier–Stokes equations using the finite-volume method with OpenFOAM, an open-source CFD software program. Taking into consideration viscous damping and vortex shedding effects, advantage of viscous damping and vortex shedding, three-dimensional numerical simulations for six-degree-of-freedom motions of a single vessel and side-by-side vessels are conducted. The simulation results for a single vessel are validated by comparison with results obtained from ANSYS AQWA software and from model testing. Simulation results for side-by-side vessels are compared with the AQWA results in order to show that the CFD code can be used effectively in predicting the motions of side-by-side vessels in regular waves.


Ships and Offshore Structures | 2018

Experimental investigation of vortex- and wake-induced vibrations of tandem cylinders

Cheol-Young Park; Seung Jae Lee; Seung Hyeon Park

ABSTRACT This paper presents the experimental investigation of the wake-induced vibration (WIV) and vortex-induced vibration (VIV) acting on two circular cylinders. In particular, a riser installed in an offshore field may experience flow interferences between adjacent risers. Accordingly, the scaled models are arranged in a tandem configuration to observe the flow interference between the cylinders. The upstream cylinder is either fixed or allowed to have one-degree of freedom (1-DOF) motion, whereas the downstream cylinder is allowed to have two degrees of freedom (2-DOF) motion. The experimental test is conducted in a circulating water channel with cylinders that are connected by linear springs in two horizontal directions. A three-dimensional displacement metre and load cell are employed to measure the motion and hydrodynamic force of the cylinder, respectively. From the experiment, we identify that there are relative effects between the VIV and WIV with respect to selected parameters.


Journal of Performance of Constructed Facilities | 2017

Long-Term Performance of Recycled Concrete Aggregate for Subsurface Drainage

Toni McCulloch; Donghoon Kang; Ryan Shamet; Seung Jae Lee; Boo Hyun Nam

AbstractRecycled concrete aggregate (RCA) is one of many sustainable construction materials, and its use in drainage systems by replacing virgin aggregate is beneficial from both economic and envir...


Journal of Ocean Engineering and Technology | 2015

Calculation of Load on Jacket Leg during Float-over Installation of Dual Topsides using Single Vessel

Dong-Yeol Bae; Seung Jae Lee; Jae Yong Lee

The float over method is the most preferred method for installing heavy topside onto a jacket platform. A very complex platform with multiple jacket structures on a specific field requires multiple installation procedures. This study validated the installation of two topsides using a single installation barge to reduce the operation and installation cost. The hydrodynamic properties of the installation barge during the installation of two topsides were calculated. The tension and fender forces during docking were investigated to show the validity of the proposed dual topside installation method. In conclusion, the operational safety of the proposed procedure was validated through the calculation of the motion of the installation vessel and loads on the jacket legs.


International Journal of Naval Architecture and Ocean Engineering | 2015

Study on variation in ship's forward speed under regular waves depending on rudder controller

Sung-soo Kim; Soon-Dong Kim; Donghoon Kang; Jong-Hyun Lee; Seung Jae Lee; Kwang Hyo Jung

ABSTRACT The purpose of this research is to compare and analyze the advanced speed of ships with different rudder controller in wavy condition by using a simulation. The commercial simulation tool named AQWA is used to develop the simulation of ship which has 3 degree of freedom. The nonlinear hydrodynamic force acting on hull, the propeller thrust and the rudder force are calculated by the additional subroutine which interlock with the commercial simulation tool, and the regular wave is used as the source of the external force for the simulation. Rudder rotational velocity and autopilot coefficients vary to make the different rudder controller. An advanced speed of ships depending on the rudder controller is analyzed after the autopilot simulations.


Journal of Ocean Engineering and Technology | 2013

Study on Simulation of Subsea Production System

Ju Yong Park; Hyo Jae Jo; Seung Jae Lee

The purpose of this study was the implementation of a simulation for a subsea production system. This subsea production system is installed under environments with high pressure and low temperature. Most of the processes for oil and gas production occur in the subsea equipment. Therefore, an understanding and study of subsea production systems is very difficult because people cannot directly observe the processes occurring in the subsea production system. A simulation system can be a useful solution for this difficult problem. In this research, information models and a 3-D graphic model of the subsea equipment were built using the object-oriented technology and 3-D CAD. The entire system was implemented with the help of simulation software, 3-DVIA Virtools. The simulation system for the subsea production system was tested using several production process scenarios. The results of the tests showed that the simulation system is very useful for understanding a subsea production system and could be a good educational tool.


International Journal of Ocean System Engineering | 2012

A study of flow structure of bichromatic waves through PIV analysis

Hyo-Jae Jo; Seung Jae Lee; Je-Eun Choi

An experimental study was carried out in order to understand the kinematics of bichromatic waves. Bichromatic waves are generated in a two-dimensional wave tank, and measured by panorama PIV technique, which allows the flow fields to be captured with respect to a spatial coordinate system. We compared wave profiles and velocities of wave particles obtained by experiment with theoretical results using Stokes 1st and 2nd order waves. The velocity distribution at wave crest and trough of the highest and lowest point of a bichromatic wave are investigated in this study.


Journal of Ocean Engineering and Technology | 2011

Experimental Study in Kinematics of Rogue Wave

Hae-jin Choi; Kwang Hyo Jung; Sungbu Suh; Seung Jae Lee; Hyo Jae Jo; Han Suk Choi

The rogue wave was generated in a two-dimensional wave tank the rogue wave kinematics was investigated including local and convective accelerations of the water particle and verification of existing prediction methods. PIV technique was applied to measure the wave kinematics near the wave crest which extended to compute the local and convective accelerations. The experimental results were compared with several analytical predictions. The convective acceleration under the crest of rogue wave has a similar magnitude with the local acceleration.


International Journal of Naval Architecture and Ocean Engineering | 2016

An experimental study of a circular cylinder's two-degree-of-freedom motion induced by vortex

Shin-Woong Kim; Seung Jae Lee; Cheol-Young Park; Donghoon Kang


Brodogradnja | 2018

COMPARISON STUDY OF EXPERIMENTS AND PREDICTIONS OF WAVE KINEMATICS FOR ROGUE WAVE

Hae-jin Choi; Seung Jae Lee; Hyo Jae Jo; Gang Nam Lee; Kwang Hyo Jung

Collaboration


Dive into the Seung Jae Lee's collaboration.

Top Co-Authors

Avatar

Donghoon Kang

Gyeongsang National University

View shared research outputs
Top Co-Authors

Avatar

Hyo Jae Jo

Korea Maritime and Ocean University

View shared research outputs
Top Co-Authors

Avatar

Cheol-Young Park

Korea Maritime and Ocean University

View shared research outputs
Top Co-Authors

Avatar

H.T. Ok

Korea Maritime and Ocean University

View shared research outputs
Top Co-Authors

Avatar

J.H. Choi

Korea Maritime and Ocean University

View shared research outputs
Top Co-Authors

Avatar

Dong-Yeol Bae

Korea Maritime and Ocean University

View shared research outputs
Top Co-Authors

Avatar

Gang Nam Lee

Pusan National University

View shared research outputs
Top Co-Authors

Avatar

H. C. Song

Korea Maritime and Ocean University

View shared research outputs
Researchain Logo
Decentralizing Knowledge